Most of the hobbyists I speak to that have failed linux desktop experiences mostly switch back to windows due to:

1. Hardware compatibility issues.
2. Microsoft office interoperability limitations of the web based office.
3. Display scaling issues on multi-monitor setups and some linux applications.

Personally for me the list is:

1. Bluetooth not being detected on my particular asus laptop. (The same bluetooth chip works in other laptops)
2. Multi-monitor scaling and resolution issues when 3 external monitors are connected via thunderbolt doc.
3. Lack of good alternatives to fancyzones